280508 has 12 divisors (see below), whose sum is σ = 512400. Its totient is φ = 134112.

The previous prime is 280507. The next prime is 280513. The reversal of 280508 is 805082.

280508 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1433 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (42700).

2²⁸⁰⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

280508 is a deficient number, since it is larger than the sum of its proper divisors (231892).

280508 is a wasteful number, since it uses less digits than its factorization.

280508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076 (or 3074 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 280508 is about 529.6300595699. The cubic root of 280508 is about 65.4608666267.

The spelling of 280508 in words is "two hundred eighty thousand, five hundred eight".